Drainage device for vacuum-pumps and the like.



E. P. WORDEN.

DRAINAGE DEVICE FOR VACUUM PUMPS AND THE LIKE. APPLICATION FILED NOV. 30. um.

1,301.3209. Patented Apr. 22, 1919;.

' anvwntoz $51 Gnome/1 UNITED STATES PATENT FFKQE.

EUCLID r. woRnEiijor Moiv'roEAI NEW JERSEY, ASSIGNOR TO HENRY R.

. WORTHINGTON, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed November 30, 1917. Serial No. 204,528.

To all whom it may concern I Be it known that I, EUCLID P. WORDEN,

a citizen of the United States, residing'at Montclair, county of Essex, and State of New Jersey, haveinvented certain new and useful Improvements in Drainage. Devices and passages. This water is chiefly from.

three sources, viz., entrained moisture brought over from. the condenser with the air; moisture resulting from the chilling effect of the cold jackets of the vacuum pump; and moisture which is precipitated by the compression of the air to atmospheric pressure for delivery.

The especial object of the invention is the provision of a simple and efficient means for the removal of this water, which will be entirely automatic in its operation, re-

quire no mechanical connection to any moving part of the pump, and depend for its action upon the pressures in the cylinder of the vacuum pump or other device with which it is used.

For a full understanding of the invention a detailed description of a construction embodying the same will now be given in connection with the accompanying drawing, forming a part of this specification and illustrating a preferred embodiment of the invention, and the features forming the invention then specifically pointed out in the claims.

In the drawing- Figure 1 is a longitudinal section of the single cylinder two-stage vacuum pump diserates piston 11, withdrawing air from a condenser or like device (not shown) through suction passage 12 and valve 18. Upon the reverse movement or transfer stroke ofthe plunger 11, this air is driven through valve 18, and transfer passage 13, provided with the usual hand-operated drain 14, to the compression side of the plunger. During the suction stroke of the piston 11, this air is compressed and forced through discharge valve 19, puppet valve 15, and passage 16 to the pump outlet 17.

The construction embodying the present invention, in the form shown, consists of a casting 1, having a drain passage 2 connected by pipe 3 with the transfer passage 13 of the pump. Above drain passage 2 is a small chamber 8, which receives the liquid from passage 2 through a port controlled by inlet valve 6 and from which the liquid is discharged through a port controlled by outlet valve 7 into discharge pipe 9. The inlet and outlet valves 6, 7 are shown as common ball valves, but any other suitable valve operated by a light pressure may be used. The chamber 8 is connected by passage 4 and pipe 5 with the second or compression stage end of the vacuum pump cylinder 10.

l The operation of the device is as follows: During the transfer stroke of the piston 11 the valves 18 and 19 are rotated to the position shown in Fig. 1, thereby establishing communication between the two sides of the piston and the transfer passage 13 whereby the pressures in the transfer passage 13 and the cylinder 10 are equalized or nearly so. This same pressure equalization is communicated to the opposite sides of the inlet Valve 6 through passage 2 and pipe 3 and through passage 4 and pipe 5, whereby the water accumulated in the passage 13 is allowed to drain by gravity through pipe 3 and passage 2, raising inlet valve 6 and passing to the chamber 8 between the valves and into passage 4. On the return or suction stroke of the piston 11, the pressure of the second stage is gradually increased to a pressure above atmospheric for discharge to the atmosphere, and this pressure communicated to the water within the passage 4 through connection pipe 5 closes the inlet valve 6, opens the discharge valve 7 and forces the water out through pipe 9. During this same stroke any water precipitated in the com pression end of the cylinder will be forced through pipe 5 to the passage 4 and ejected with that from drain passage 2.

The delivery of water from the transfer passage 13 to the second stage of the vacuum pump on the transfer stroke is prevented, as the vacuum in the second stage is so very little higher at any time during this stroke than that in the transfer passage 13, that it is insufficient to overcome the difierence in level.

It will be understood that the invention is not to be limited to the specific form of the construction shown, as this may be varied widely, nor to use in or with single cylinder two sta'ge vacuum pumps, as the broader features of the invention may be used with vacuum pumps and compressors of other types.

What is claimed is:

1'. In combination with the cylinder of a vacuum pump or the like, a drain passage having a pressure o-perated valve therein opening away from said cylinder, and a sec ond passage connecting thecylinder with the drain passage outside the valve, whereby the suction and discharge pressures of the cylinder are applied alternately outside the valve for withdrawal and discharge of liquid.

2. In combination with the cylinder of a vacuum pump or the like a drain passage having an inlet valve and a discharge valve therein, and a second passage connecting said cylinder with the space between said valves, whereby the suction and discharge pressures of the cylinder are applied alternately between the valves for withdrawal and discharge of liquid.

3. In combination with a single cylinder two stage vacuum pump, a drainpassage connected with the transfer passage of the pump, a pressure-operated valve within said assage and opening away from said transer passage, and a second passage connecting the second stage end of the cylinder with said first mentioned passage outside said valve, whereby thepressures within said second stage are applied alternately. outside said valve for withdrawal andidischarge of liquid.

4. In combination with a single cylinder two-stage vacuum pump, a drain passage connected with the transfer passage of the pump, an inlet and an outlet valve in said passage, and a second passage connecting the second stage-end of said pump with the chamber between said valves, whereby the pressures within saidstage are applied alternately between said valves for withdrawal and discharge of liquid.

5. The combination with twoi-stage cylinder 10 and transfer passage 13, of' chan1ber 8 having drain passage 2 connected, with transfer passage .13, inlet valve '6 and outlet valve 7, and passage '4 connectingsaid chamber between the valves'with the compression end of cylinder 10, whereby the pressures within said compression end are applied alternately between the valves for withdrawal and discharge of liquid.

In testimony whereof I have hereunto set my hand.

EUGLID R'WORDEN.

Copies of this patent may be obtained for five cents eachpb'y addressing the Commissioner ofEPatents, Washington, D. 01" 

